In the year 1991 the predecessor of YIT Ehitus started activities, having at different times in its development had the name AS FCM and AS FKSM. In the year 2001 the largest Finnish group offering construction services, YIT, obtained a qualifying holding of the company. Since February of the year 2005 the company had the name AS YIT Ehitus.
The predecessor of Lemminkäinen Eesti was AS Talter which started operations in Estonia in the year 1991. In the year 1992 Lemminkäinen Eesti AS was founded. In the year 2004 Lemminkäinen group became the main owner of Talter and since the year 2009 the company had the name Lemminkäinen Eesti AS. In the year 2017 the councils of the construction groups YIT and Lemminkäinen decided to merge the companies.
On the 1st of February 2018 the new YIT was born as a result of the merger of YIT and Lemminkäinen, which were both more than 100 years old. During the merger process, the business name of YIT Ehitus became YIT Eesti and Lemminkäinen started using the business name YIT Infra Eesti.
Since the 25th of January 2019 the business activities of AS YIT Eesti and YIT Infra Eesti AS continue jointly under the business name AS YIT Eesti. The register code is 10093801.